Feed mechanism for saw-sets



(No Model.)

H. H. HITOHGOOK.

FEED MECHANISM FOR SAW SETS.

Patented Aug. 25. 1885.

VIII/III, I

I all/111111 lUNiTEb STATES PATENT OEEICE.

IIIRAM H. IIITCHFOCK, OF DETROIT, MICHIGAN.

FEED MECHANISM FOR SAW-SETS.

SPECIFICATION forming part of Letters Patent No. 325,080, dated August 25, 1885.

(No model.)

T0 (0% whom it may concern:

Be it known that I, IIIRAM H. HrrcHoooK, of Detroit, in the county of IVayne and State of Michigan, have invented new and useful Improvements in Feed Mechanism for Saw- Sets; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to certain new and useful improvements in feed-mechanism attachments to saw-sets, such mechanism being especially adapted to feed the saw under treatment automatically with each successive movement of the set upon the tooth.

In using a saw-set of any of theknown constructions for setting the teeth of a straight saw or a bent saw it becomes necessary as each successive tooth, or alternate tooth, or combination of teeth is operated upon by the set that the next tooth, alternate tooth, or combination oi'teeth be presented forthe next succeeding operation.

The object of this invention is to provide means by which the motion of the saw-set in releasing the impact between the set proper and the tooth will actuate mechanism which will feed the saw up suificiently far upon the anvil or bed-plate as to present the right tooth to the next operation of the set.

The invention consists in providing feedworks so attached to and connected with a saw-set that the operations of the latter will actuate such feed-works.

It further consists in the peculiar construction of its parts and their combinations and operation, as more fully hereinafter described.

Figure 1 is a perspective view of my improved feed-works as attached to a stationary saw-set, such as was patented to myself on the 11th day of April, 1882. Fig. 2 is a side elevation of the same, and Fig. 3 is a sectional detail.

In the accompanying drawings, which form a part of this specification, A represents a bed which supports the device; 13, the table upon which a saw-blade is designed to rest; 0, the lever by means of which the saw is released from its engagement; D, the stop which limits the downward thrust of the lever; E, the sawset or punch which gives the set to the tooth, and m the circular steel disk which prevents the possibility of bruising the teeth by heavy blows upon the die; and these parts are all constructed as described in my aforesaid Letters Patent, except as hereinafter mentioned.

The lever O is bifurcated a part of its length to inclose a die or set, and it is fulcrumed to a standard, H, rising from the bed, and projects beyond or in rear of such pivotal point. Its lower end is curved rearwardly and upwardly, as shown at a, and a setscrew, F, is provided, which passes through a slot in the cross-bar (Z, which ties the rear ends of the lever together, and thence through an adj ustable nut, c, and its lower end passing into the bed A. A spring is interposed between the top oi'such cross-bar and the head of the screw, as a means for giving the opposite end of the lever an upward movement, which saves the hand from imparting such movement, and this upward movement is limited by the adj ustable thumb-nut c or the set-screw F. This adj ustability is necessary to give a greater or lesser throw or vibration to the set-Works, to compel the implement to operate upon points of different lengths or sizes of the teeth.

G is a standard rising from the bed, and has pivotally secured to it by means of the bolt (1 the vibrating gate H. Connecting the overhanging end e of this gate with the lever O is aconnectingrod, I, connected at one end to the overhanging end 6 by a ball-andsocket joint, Z), as shown in dotted lines in Figs. 1 and 2, and the opposite end of this rod is also connected or secured to the side of the lever by a similar ball-andsocket joint, g, as shown in Fig. 1, or by other suitable joints that will answer the purpose. This rod is madein two parts, the free ends of which are adjustably secured together by a turnbuckle, J, of the ordinary construction. It is necessary that the length of this rod should be adjustable, so

that the positions of the vibration imparted to the pendulum ofthe gate H by the lever C may be transferred or adjusted also so that it will occupy the right position to bring the tooth to be set under the punch coincident to the termt nation of the feeding movement of said pendulum, the feeding movement being that which moves the saw. By shortening said connecting-rod the position would be transferred to the left, which would cause the tooth to be operated upon to stop farther to the left eoincident with the termination of the feeding movement; but by lengthening such rod it would cause the position to be transferred to the right, thus presenting the tooth farther to the right coincident withthe termination of the feed movement; therefore, by these means the teeth to be operated upon can be caused to stop directly under the punch coincident with the termination of the feeding movement; but the length of said vibrating movement is indirectly limited by the setscrew F or thumb-nut 0, so as to accommodate it to feeding saws of only two teeth to the inch up to those of sixteen teeth to the inch, and said length of vibration is regulated or adjusted as given below in the direction for setting saws.

Guides h project from the front face of the gate H, being arranged vertically one above the other, with vertical slots in each coincident to cach, and in these slots is placed the pawl K, it being held in position by means of the spring L, coiled around the center guide. This pawl should move with great freedom, and hence it is not pivotally secured in the guides anywhere; but the front end of the spring may be so arranged as to connect with it and prevent its falling out of the slots or becoming displaced.

Mis a yoke designed to be adj ustabl y secured to the slotted standards N by means of bolts i, which pass through the slots in the ends of the yoke and the slots in the standards N in such manner that it may be adjusted to and fro and vertically. This yoke is provided with a spring-clamp, P, designed to engage with the saw-blade R R are spring-guides passing through the yoke to impinge against the rear face of the saw and hold it in position. The construction ofthese spring-guides R is shown in Fig.3.

Another elastic pressure-guide, S, made of rubber, is inserted in the yoke and held in place by projections it above and below.

The feeding device,having been constructed as described, is now ready for operation, and I will describe it as in operation setting the band-saw without removing the saw from its hangings, the saw being shown in such position at the top of Fig.1, but broken off in order to better illustrate the various parts and their operation. The lower loop of the saw is inserted into the slots of the yoke, which are open at their forward ends, as shown in Fig. 1, for the purpose, and the back of the blade itself is clamped by the spring-clamp and rests against the spring or pressure guides R R S. The yoke is then secured to the standard N, the part of the saw held in the yoke being in a horizontal position, resting on the table B, as shown in dotted lines in Fig. 1,the length of the arms of the yoke being sufficient to bring the saw in proper position to be operated on by the pawl K, as will be explained hereinafter. Now press the lever 0 down upon the saw, thus clamping the saw with the cross-lipn of said lever, and then raise said lever till the pawl K at the point of contact with the saw has passed through the space of the width of two and one-half teeth, and at this point limit the upward movement of this lever, and hence the length of the vibration of the pendulum of the gate H, by means of the adjustable thumb-nut or set screw, and then proceed to feed the saw by producing the vertical movement of the lever O to and fro to its limited extent, and if it is observed that the teeth to be set do not come under the die E coincident with the termination of the feeding movement,tl1en transfer or adjust the position of the vibration of the pendulum of the gate as shown above, so that the teeth to be operated upon will be presented directly under the punch coincident with the termination of the feeding movement.

By feeding the saw as directed. the operator sees that the pawl K passes over the inclines of two teeth and half-way up the incline of the third, and that in its opposite movement the saw is not moved until the pawl K comes in contact with the perpendicular side of the adjacent tooth, and hence the saw is moved only the distance of the width of two teeth, or from one tooth to the next alternate tooth, and the reason the length of vibration is adjusted to pass through more space than is occupied by the two teeth is to make it certain that the pawl K will pass over two teeth irregular in width, thus making it certain to present the right tooth to be operated upon under the die. This irregularity of teeth is caused by improper filing. I

The novelty of this feeding mechanism is summed as follows: The said vibration is adjusted to any-sized tooth simply by turning the adjustable nut c, and the correct position of said vibration is adjusted simply by turning the adjustable thumbbuckle J, and the sawis set by striking the die with a hammer at each presentation of the tooth.

The various devices which have been mentioned allow these adjustments to be made, so that any-sized teeth or saw within the limit of the machine may be operatedupon with perfect certainty automatically by the movement of the lever and intermediate mechanism actuated by such lever, all for intermittently moving the saw.

\Vhat I claim as my invention is- 1. In a saw-setting mechanism, an oscillating gate carrying a tooth-engaging pawl, an operating-lever,and adjustable connections between said lever and gate, whereby the throw of the pawl is regulated at will to feed the saw, as set forth.

2. The combination,with a bifurcated lever, G, carrying the setting device between its arms, and pivoted as shown, of the gate H,

screw F, nut c, and adjustable connectingrod I, whereby the length of stroke may be adjusted in either direction, as set forth.

3. The combination,with the gate H,having ball-socket b, and the lever 0, having socket g, of the connecting-rod I, made in two parts, and the adjusting turn-buckle J, as and for the purposes set forth.

4. In asaw-setting inechanism,as described, the oscillating gate H, having horizontal lugs h, with vertical slots, in combination with the pawl K, recessed as shown, and the spring L, operating within said recess and aga'nst the pawl, to hold it in the outer portions of the slots with freedom to move, as set forth.

5. In combination with a saw-set havingan adjustable lever, an oscillating gate connected with said lever by means of an adjustable connectingrod, as I, and a pawl, K, carried by said gate, substantially as and for the purposes described.

6. In combination with a saw-set having a feeding mechanism attached thereto, an adjustable yoke, as M, having a spring-clamp, P, and spring-guides R S, for holding the saw and keeping it in position, the parts being constructed and operating substantially as and for the purposes specified.

7. In a saw-set, the combination of the lever C, connectingrod I, vibrating gate H, pawl K, and yoke-guide M, the parts being constructed and operating substantially as and for the purposes set forth.

8. In a saw-set having a feeding mechanism attached thereto, the slotted standards N, in combination with the yoke M, having open slotted ends, and the bolts 2, whereby such standards and. yoke are removably and adj ustabl y secured together, substantially as and for the purposes described.

9. In a saw-set having feeding mechanism attached thereto, the gate H, having projecting and slotted guides h, in combination with the pawl K and spring L, substantially as and for the purposes specified.

10. In combination with a saw-set having feed mechanism attached thereto, the yoke M, having a spring-clamp, P, substantially as de scribed.

11. In combination with a saw-set having feed mechanism attached thereto, the yoke M. having one or more spring-guides, R and S, substantially as specified.

HIRAM I-I. HITGI-IOOCK.

\Vitnesses:

H. S. SPRAGUE, CHARLES J. HUNT. 

